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TRACER STUDIES ON CALCIUM AND STRONTIUM MINERALIZATION AND MINERAL CYCLING IN TWO SPECIES OF FORAMINIFERA, ROSALINA LEEI AND SPIROLOCULINA HYALINA 1
Author(s) -
McEnery Marie,
Lee John J.
Publication year - 1970
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1970.15.2.0173
Subject(s) - foraminifera , strontium , calcium , mineralization (soil science) , seawater , environmental chemistry , chemistry , calcareous , hydrostatic pressure , barium , cycling , zoology , biology , ecology , botany , benthic zone , inorganic chemistry , history , thermodynamics , physics , organic chemistry , archaeology , soil water
Mineral cycling in the calcareous foraminifera Rosalina leei and Spiroloculina hyalina was traced with 45 Ca and 90 Sr. Incorporation of these radionuclides as well as 35 S and 32 P was proportional to growth when they were introduced into the system in the range of 1 × 10 4 – 1 × 10 5 dpm/ml of medium ( 90 Sr specific activity ∼ 109 µ Ci/g; 45 Ca specific activity 160 µ Ci/g; 35 S specific activity 95 µ Ci/g; 32 P specific activity 2.03 mCi/g). Although 14 C was a good indicator of growth during the first 3 weeks, its usefulness declined as the cultures aged. Some 45 Ca and 90 Sr was adsorbed to dead tests. Both foraminifera were decalcified by treatment with 0.01% Na 2 EDTA in seawater at p H 8.1. Recalcification and growth took place when individuals were returned to control media. Ten to 0.1 µ m 2‐acetylamino‐1,3,4‐thiadiazole‐5‐sulfonamide (Diamox) inhibited Ca but not Sr incorporation into the test. Calcium and strontium were lightly bound to foraminiferan shells and under conditions of alkaline p H and low hydrostatic pressure these did not exchange with environmental ions.